iOS - How To Rotate imageView 360 degree From its center

Question

i want to rotate my imageView in my iOS app 360 degree from its center

(when my label text is "hello")

please help me

if ([myLabel.text isEqualToString:@"hello"] == YES)
{
    //here i want the imageView to rotate

}

Rotate percent? Degrees? 360 goes back to where you started. Image of what you want? What did you try and what did it do wrong? — Wain, Dec 15 '13 at 12:33
http://stackoverflow.com/questions/19406166/ios-a-complete-360-degree-rotation-using-block-not-cabasicanimation — Wain, Dec 15 '13 at 12:38
You won't even notice a 360 degree rotation because 360%360=0 — Christian Schnorr, Dec 15 '13 at 12:43

user2734323 · Accepted Answer · 2013-12-15T13:49:38.923

5

It seems you want it animated. Otherwise, there is no change in image view.

#define DEGREES_IN_RADIANS(x) (M_PI * x / 180.0);

[UIView animateWithDuration:duration animations:^{

imageView.transform = CGAffineTransformMakeRotation(DEGREES_IN_RADIANS(360));

} completion:nil];

edited Dec 15 '13 at 13:49

answered Dec 15 '13 at 12:46

user2734323

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this will typed in the if block right – user3091937 Dec 15 '13 at 12:51
define statement will go along with import statements. The rest will go inside your IF loop. Make sure that you change imageView (in imageView.image) to whatever name you have provided in your code. Also, change 'duration' to whatever time you would like. – user2734323 Dec 15 '13 at 12:53
be with me one minute – user3091937 Dec 15 '13 at 12:55
i 'll try it and tell you – user3091937 Dec 15 '13 at 12:56
the compiler makes an error symbol beside this line of code imageView.image.transform = CGAffineTransformMakeRotation(DEGREES_IN_RADIANS(360)); – user3091937 Dec 15 '13 at 13:01
What is the error? Did you add #define statement? – user2734323 Dec 15 '13 at 13:04
yeah the compiler says that property transform not found on object type 'UIImage *' – user3091937 Dec 15 '13 at 13:06
You rotate UIImageView.image, not UIImage. You need to have UIImageView and you then assign .image = . Then, you rotate .image. If still finding difficulty, post your code. – user2734323 Dec 15 '13 at 13:34
My bad. Change from imageView.image.transform to imageView.transform. It should work. – user2734323 Dec 15 '13 at 13:50
if ([myLabel.text isEqualToString:@"hello"]) { [UIView animateWithDuration:1 animations:^{_imageView.transform = CGAffineTransformMakeRotation(320 * M_PI / 180.0); } completion:nil]; } – user3091937 Dec 15 '13 at 13:54
this the code that i have written but the imageView don't rotate also – user3091937 Dec 15 '13 at 13:55
No , No , it is my fault , it is now rotating thank you – user3091937 Dec 15 '13 at 13:57
but how to increase the rotation speed – user3091937 Dec 15 '13 at 13:58
You can adjust duration to increase or decrease speed. Check out animateWithDuration:animations in https://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/uiview/uiview.html#//apple_ref/occ/clm/UIView/animateWithDuration:animations: – user2734323 Dec 15 '13 at 15:30
+1 for the radians conversion – mcont Jun 28 '14 at 19:36
The first line should be: `#define DEGREES_TO_RADIANS(x) (M_PI * (x) / 180.0)` (no semi-colon and parenthesis around the `x`). The current code produces this error: `Implicit declaration of function 'DEGREES_TO_RADIANS' is invalid in C99`. – Jimmy Schementi Jan 08 '15 at 00:51

score 1 · Answer 2 · answered Dec 15 '13 at 12:37

1

myLabel.transform = CGAffineTransformMakeRotation(degrees * M_PI / 180.0);

If you want ti have it animated, wrap it in an animation block:

[UIView animateWithDuration:duration animations:^{

} completion:nil];

answered Dec 15 '13 at 12:37

Christian Schnorr

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what i will type in if ([myLabel.text isEqualToString:@"hello"] == YES) { //here i want the imageView to rotate } – user3091937 Dec 15 '13 at 12:39
what i will type in if blocks – user3091937 Dec 15 '13 at 12:40
Just put the friggin code I posted in there. – Christian Schnorr Dec 15 '13 at 12:41
in the if blocks right? – user3091937 Dec 15 '13 at 12:41
be With me one moment – user3091937 Dec 15 '13 at 12:44
................. but i want the image to be rotated – user3091937 Dec 15 '13 at 12:45
Then try it with 90 degrees maybe. You can hardly notice a 360 degrees rotation. And if you ever use more than 3 dots in a row again I will stop helping you. – Christian Schnorr Dec 15 '13 at 12:46
i think you didn't understand me – user3091937 Dec 15 '13 at 12:48
1

Then please learn to speak proper English and how to express yourself. Good luck solving your problem. – Christian Schnorr Dec 15 '13 at 12:50

iOS - How To Rotate imageView 360 degree From its center

2 Answers2